Valve silencer



Nov. 29,1927.

1,650,823 w. G. DUNN VALVE SILENCER Filed Spt. so. 1926 I J fz mibr z 7944! I p-mwmwmm J Patented Nov. 29, 1927.

rarest OFFICE.

WILLIAM G. DUNN, OF GLABINDA, IOWA.

VALVE s mmers.

Application filed September 30, 1926. Serial No. 188,656.

The object of my invention is to provide a silencer device adapted to be interposed between the rocker arm and push rod of an engine for eliminating excessive noise caused by the metallic push rod engaging the metallic rocker arm.

Still a further object is to provide a silencer formed of non-metallic material such as rubber composition provided with a (181k tral opening in its underside for receiving the upper end of a push rod and having a groove in its upper end for receiving a portion of the rocker arm. The sides of the core member being encased in a metallic sleeve whereby the core of non-metallic material will be protected against breakage when in actual use.

With these and other objects in View, my invention consists in the construction, arrangement and combination of the various parts of my device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and.

illustrated in the accompanying drawings,in which:

Figure 1, is a portion of an automobile of the over-head valve type with my improved silencer device installed thereon.

Figure 2, isa perspective view of the device, parts being broken away and shown in section to better illustrate the construction.

Figure 3, is a perspective view of a fiat fabricated disc for use upon the valve stem of the engine, and

Figure 4, is a detail sectional View taken on line 44'0f Figure 2.

In the accompanying. drawings I have used the reference numeral to indicate generally an engine of the overhead valve type. The engine 10 is provided with a rocker arm 12 having a valve tappet cam 14 at one end and an adjusting screw 16 at its other end.

The adjusting screw is formed with a ball head 18 normally designed to engage the upper end of a push rod 20. The cam 14.- is

normally designed to engage a valve stem 22. Upon the valve stem 22 is mounted a coil spring 24. 1

The parts just described are of the ordinary construction used in the manufacture of automobile engines such as the Chevrolet.

The rocker arm engaging the push rod 20 and the valve stem 22 causes a metallic jingle and this is overcome by the useof the silencer which I will now describe in detail.-

My improved device consists of a nonmetallic core .member 26 formed of hard rubber or rubber composition.- The core member 26 is formed with a central opening 28 of' considerable length and which opens through the underside of the core member 26.

The opening 28 is the same diameter as the push rod 20 whereby the core member 26 maybe mounted upon the push rod 20 as illustrated in Figure lot the drawings. The upper end of the core member 26 is formed with a groove 30 which is semi-circular in crosssection and receives the ball head 18 of the adjusting screw 16.

The interposing of the non-metallic core member 26 between the ball head 20 and thepush rod 18 eliminates the undesirable noise ordinarily accompanying an overhead valve motor.

The core member 26 is protected against easy destruction or splitting by a metallic sleeve 32. The constant working of the push rod 20 against the rocker arm 12 causes the core member .26 to split, thus rendering them ineffective and drawing the particular push rod out of proper coaction with the rocker arm 12.

The sleeve 32 protects the core member 26 against splitting and even if it should split it would still be held together upon the push rod 20 by the sleeve 32.

The upper and lower edges of the sleeve 32 are rolled over and against the upper and lower ends of the core 26 so as to provide rolled edges 34.

The rolled edges 84: terminate short of the opening 28 and short of the groove 30 so as not to possibly connect or strike against the ball member 18 and the push rod 20.

. Upon the upper end of the valve stem 22 I mount a fabricated disc 36 having an opening 38 in its underside which receives the upper end of the valve stem' 22. The up per surface of the disc 36 is fiat and is engaged by the cam 14 of the rocker arm 12.

The disc is illustrated in its upside down position in Fi ure 3. The disc 36'is made of a number 0% sheets of fabric such as canvas or the like, which are held I together by'suitable shellac or the like.

Thesilenoerdevice may be quickly! and posed between a rocker arm and push rod of an engine comprising a non-metallic core member having a socket in its underside for receiving the upper end of a push rod and a depression in its upper end for permitting a portion of the rockerarm to project therein and a metallic sleeve for receiving said core member having its edges rolled over the ends of said core member whereby said sleeve protects said core member when in use against easy destruction.

2. A silencer device adapted to be interposed between a rocker arm and push rod of anengine comprising a non-metallic core member having a socket in its underside for receiving the upper end of a push rod gmd a depression in its u per end for permit ing a portion of the roc er arm to project therein and a metallic sleeve for receiving said core member, rolled edges on said sleeve for extending over the ends of said core member, said rolled edges terminating short of the edge of the socket-in the underside of said core member and terminating short of the edge of the depression in the upper end of the core member.

WILLIAM G. DUNN. 

